yes, the problem was solved after installation and

syscfg.txt

dtparam=i2c_arm=on
dtparam=spi=on

# include nobtcfg.txt
include btcfg.txt

I was looking for a solution for a long time.

my pi 4b 4Gb, why there is no bluetooth?

Hello. On my raspberry 4 4GB, there is no bluetooth adapter.

In the settings it says: "Bluetooth adapters not found"